Air motor



May 14, 1935. B. DE NAGY x 2,000,930

AIR MOTOR I F'iled Feb. 17, 1934 U 554/4 0; Nagy,

h [5 ATTORNEY I Patented May 14, 1935 UNITED STATES 2,ooo,93o'

PATENT OFFICE AIR MOTOR Bela ne Nagy, New York, N. Y. Application February 17, 1934, Serial No. 1,637 s Claims. (Cl. 253 134) This invention relates to air motors and the subject matter thereof is a continuation in part of my copending application for Air motor and rotary brush, Serial No. 670,733, filed May 12th, 1933, the line of division between my two applications being that said copending application relates to specific embodiments of motor driven polishing tools and the like, while the present application relates to a specific form of air motor and a housing therefor, adapted to drive and receive, respectively, a rotary device.

The main object of my invention is to provide an air motor which may operate with weak, lowpressure air current in a novel manner.

Another object of my invention is to provide a device, as characterized hereinbefore, which will be simple in construction, emcient and reliable in operation and inexpensive to manufacture, and" which also may have a novel suction effect.

,stil1 a further object of this invention is to provide an air motor, comprising a rotor which will permit the passage cf air or other operatinggas medium therethrough even' when, by some unforeseen circumstance or forcef'said rotor is prevented from operating, thereby my device remedying a serious drawback of air motors and compressors used at present-n which, when the load or force operating against their rotating part becomes unduly large, the air current is prevented from egress and a harmful pressure is built up back of the rotor.

Inthe drawing accompanying the specification and forming a part thereof:

Fig. 1 is a partly sectional plan of my device in a specific embodiment providing means for attaching to my air motor a rotary brush, a cover ofthe device having been removed, and

Fig. 2 is a sectionai elevation thereof, on an enlarged scale, the section being taken on the line 2-2 of Fig. 1. v! Q Referring now to the drawing more closely, by characters of reference, my invention is provided with a housing ln having, in the embodiment shown, an upper compartment ll and a lower compartment I2 and a partition wall l3 between said two compartments, said housing being generally of a cylindrical shape and placed with its axis in a vertical position. In the upper compartment l l of the housing I arrange, a rotor or turbine ll, having a plurality of vanes l5, secured on a rotating disc Ha and terminated by outer and inner imaginary cylinder surfaces IG and l'l, respectively, as is well known in the art. The contour of the vanes IS may be designed according to the principles of engineering science to be most emcient for the conditions present in the particular case, but for the sake of simplicity and saving, I prefer to make them circular segments. A hub Is is also provided for the rotor ll by which the same is, secured on a vertical shaft is 5 which for this purpose may have a square portion 20 engaging said hub IB. A removable cover 2i may be provided for the housing II) and in the center thereof may be arranged a ball-bearing, generally indicated by the numeral 22' for the 10 upper end of the shaft Is.

A second ball-bearing 23 may be provided on the partition I3, shaft is projecting through said second ball-bearing 23 and the lower end 24 of said shaft may carry an operating device proper 15 25 secured thereon and to be driven by my air motor. Said operating device proper is shown herein n the form of a circular brush 26, of any suitable construction which will constantly be pressed in a downward direction against a sur- 20 face 21 to be operated on, like the floor of a room, by the helical spring 28.

The upper compartment Il of the housing III is continued in an air conduit 32 through which compressed air or other gas may be introduced, 25 as indicated by the arrow 33, from any suitable source, with a pressure and Velocity as desired. For a convenient and easy use of my invention said conduit 32' may be provided with means whereby it may be attached to an outlet cpen- 30 ing on the usual vacuum cleaner and my device operated therethrough. 1

The air will follow the internal contour of the air conduit 32 (Fig. 1) and will strike the vanes l5, asat 34, will then pass through them in a 35 certain case that is, at a certain speed, pressure and other factors of operation, following the direction generally indicated by the dot and dash line 35 and leaving the inner openings of the vanes at 35a, will pass through the space in the 0 rotor following the line 36 and will exit following the center line 31 striking the vanes once more at the opposite side of the rotor so that the same air current will act on the vanes a second time. For the exit of the air, openings 39 are provided 45 in the wall of the compartment H substantially opposite to the conduit 32 and being spread at will generally follow the conditions shown ln Fig. 1.

The air will have the shortest exit and most emcient route through my device. It will act twice on the vanes, as has been explained hereinbefore, and the air will freely pass through my device even if the rotor. Il is forced to remain idle which is a great improvement over other air turbines or motors now used. In a similar device tition l3, being of suitable sizes and distribution and when the air or other working gaseous fluid medium will escape through the openings 39, passing through the upper compartment ll, it will have a' suction effect through these openings 50 and will draw the air from the lower compartment l2 through the same, causing it to nnally leave through the openings 39 with the working air stream, and'the air in the compartment l2 may thereby be removed, as indicated by the arrows SI. This effect may be used for various benecial purposes and it will be highly desirable in case a polishing, brushing or similar device is operating in said compartment [2, as indicated n the embodiment shown in the present drawing, since this suction effect will aid in removing the dust and other particles loosened by the operation of said device and it also will aid in cooling the device and the surfaces operated on. To aid in this result, further openings 52 may be provided in the back 2611 of the brush 26 'so that the air may find a ready passage through the brush itself, as indicated by the arrow 53. X

It will be understood that changes and variations may be made in the parts and combinations of my device and I hereby reserve all my rights to any and all such changes as are within the spirit of the invention and the scope of the appended claims.

-What I claim as new is:

1. In combination, a housing having annular side walls; a partition wall integral with the side walls and dividing the housing into a closed upper and a downwardly open lower compartment; a shaft revoluble in theaxis of said housing; a rotor located in the upper compartment and locked to said shaft; the walls of said upper compartment being provided with intake and outlet air passages; means in the partition wall for permitting exhaustion of air from the lower chamber and means for driving an operating device received in' said lower chamber when the rotor is operated said rotor having curved vanes leaving a free space around the center thereof to permit an air stream to pass from the inlet through a portion of the vanes then through the central space and ,then through the vanes at "a second portion of the rotor;

2. An air motor comprising a housing separated by a wall into upper or motor and lower or operating device receiving compartments, the side walls of the upper compartment being proxided with horizontally aligned inlet and outlet air es; a rotor in horizontal alignment with said passages; means for rotating an operating device in the lower compartment when the rotor is driven by air currents passing through the upper compartment; and means in the said separating wall permitting air to be drawn from tle lower chamber through the outlet passage when the rotor is in operation said rotor having curved vanes leaving a free space around the center thereof to permit an air stream to pass from the inlet through a portlon'of the vanes then through the central space and then through the vanes at a second portion of the rotor.

3. In combination, a housing; a wall dividing said housing into upper or motor'and lower or operating device receiving compartments; an air inlet conduit comprising an integral portion of said housing and being in communication with the upper compartment; bars formed from the wall of the upper compartment for providing outlet air passages arranged opposite said conduit; a rotor located in the upper compartment a shaft connecting the rotor with an operating device in the lower compartment; and means in the said dividing wall permitting air flow from the lower to the upper compartment through suction generated by the operation of said rotor said rotor having curved vanes leaving a free space around the center thereof to permit an air stream to pass from the inlet through a portion of the vanes then through the central space and then through the vanes at a second portion of the rotor.

4.- In an air motor, a substantially horizontal rotor; a housing enclosing said rotor; vanes on the periphery of said rotor, said vanes stopping short of the center so as to provide a space around the axis of the rotor between the inner terminations of said vanes; means to guide a stream of air or other similar gaseous uid medium through a part of the housing to a portion of the outer circumference of said vanes, said stream being adapted to pass through the vanes at'that portion of the circumference, then through said central space, and then through the vanes at a second portion of the rotor, and means to permit the exit of said stream at a second part of the outer wall of the housing; a substantially enclosed space underneath said housing for receiving an operating device, openings being provided between the inner space of said housing and said space underneath thereof, so as to cause the air stream passs central space and then through the vanes at a second portion of the rotor; means providinga receiving space underneath said housing for an operating device; openings being provided between said housing and said receiving space to rpermit the passage of air in said receiving space through said housing under the suction enect of said stream of air, and thereby aid the emcient and clean operation of said device."

BELA DE NAGY. 

